{- |

Module : $Header$

Description : Static analysis for the Edinburgh Logical Framework

Copyright : (c) Kristina Sojakova, DFKI Bremen 2010

License : GPLv2 or higher, see LICENSE.txt

Maintainer : k.sojakova@jacobs-university.de

Stability : experimental

Portability : portable

-}

module LF.Analysis where

import LF.AS

import LF.Sign

import LF.Twelf2GR

import Common.ExtSign

import Common.GlobalAnnotations

import Common.AS_Annotation

import Common.Result

import Common.DocUtils

import qualified Data.Map as Map

import System.IO.Unsafe

sen_type_exp :: EXP

sen_type_exp = Type

gen_file :: String

gen_file = "gen_twelf_file.elf"

gen_sig1 :: String

gen_sig1 = "GEN_SIG"

gen_sig2 :: String

gen_sig2 = "GEN_SIG_SEN"

gen_ax :: String

gen_ax = "gen_ax"

numSuf :: String -> Int -> String

numSuf s i = s ++ "_" ++ show i

mkSig :: String -> String -> String

mkSig n cont = "%sig " ++ n ++ " = {\n" ++ cont ++ "}.\n"

mkIncl :: String -> String

mkIncl n = "%include " ++ n ++ " %open.\n"

mkRead :: String -> String

mkRead n = "%read \"" ++ n ++ "\".\n"

getSigItems :: [Annoted BASIC_ITEM] -> [Annoted BASIC_ITEM]

getSigItems = filter ( \ (Annoted i _ _ _) ->

case i of

Decl _ -> True

Form _ -> False )

getSenItems :: [Annoted BASIC_ITEM] -> [Annoted BASIC_ITEM]

getSenItems = filter ( \ (Annoted i _ _ _) ->

case i of

Decl _ -> False

Form _ -> True )

getSensFromDefs :: [DEF] -> [(NAME,Sentence)]

getSensFromDefs [] = []

getSensFromDefs ((Def s _ (Just v)):ds) = (symName s, v) : getSensFromDefs ds

getSensFromDefs _ = error "Sentences cannot be retrieved from definitions."

makeNamedForms :: [(NAME,Sentence)] -> [[Annotation]] -> [Named Sentence]

makeNamedForms ss as = map makeNamedForm $ zip ss as

makeNamedForm :: ((NAME,Sentence),[Annotation]) -> Named Sentence

makeNamedForm ((n,s),annos) =

let implies = or $ map isImplies annos

implied = or $ map isImplied annos

isTheorem = implies || implied

in (makeNamed n s) {isAxiom = not isTheorem}

-----------------------------------------------------------------

-----------------------------------------------------------------

-- basic analysis for LF

basicAnalysis :: (BASIC_SPEC, Sign, GlobalAnnos) ->

Result (BASIC_SPEC, ExtSign Sign Symbol, [Named EXP])

basicAnalysis (bs@(Basic_spec items), initsig, _) = do

let (sig,sens) = unsafePerformIO $ makeSigSen initsig items

let syms = getSymbols sig

let fs = makeNamedForms sens $ map r_annos $ getSenItems items

return (bs, ExtSign sig syms, fs)

-- constructs the signatures and sentences

makeSigSen :: Sign -> [Annoted BASIC_ITEM] -> IO (Sign,[(NAME,Sentence)])

makeSigSen sig items = do

let contents = makeFile sig (getSigItems items) (getSenItems items)

writeFile gen_file contents

libs <- twelf2SigMor gen_file

getSigSen libs

{- constructs the contents of a Twelf file used to analyze the signature

and sentences -}

makeFile :: Sign -> [Annoted BASIC_ITEM] -> [Annoted BASIC_ITEM] -> String

makeFile sig sig_items sen_items =

let sen_type = show $ pretty sen_type_exp

cont1 = if (sig == emptySig) then "" else show (pretty sig) ++ "\n"

cont2 = printSigItems sig_items

cont3 = printSenItems sen_type sen_items

sig1 = mkSig gen_sig1 $ cont1 ++ cont2

sig2 = mkSig gen_sig2 $ mkIncl gen_sig1 ++ cont3

in sig1 ++ "\n" ++ sig2

printSigItems :: [Annoted BASIC_ITEM] -> String

printSigItems [] = ""

printSigItems (i:is) =

case i of

Annoted (Decl d) _ _ _ -> d ++ ".\n" ++ printSigItems is

_ -> printSigItems is

printSenItems :: String -> [Annoted BASIC_ITEM] -> String

printSenItems sen_type items = printSenItemsH sen_type 0 items

printSenItemsH :: String -> Int -> [Annoted BASIC_ITEM] -> String

printSenItemsH _ _ [] = ""

printSenItemsH sen_type num (i:is) =

case i of

Annoted (Form f) _ _ _ ->

let lab = getRLabel i

lab' = if null lab then numSuf gen_ax num else lab

num' = if null lab then num + 1 else num

in lab' ++ " : " ++ sen_type ++ " = " ++ f ++ ".\n" ++

printSenItemsH sen_type num' is

_ -> printSenItemsH sen_type num is

{- retrieves the signature and sentences corresponding to the

original basic spec out of a Twelf file -}

getSigSen :: LIBS -> IO (Sign,[(NAME,Sentence)])

getSigSen libs = do

file <- resolveToCur gen_file

let (sigs,_) = Map.findWithDefault (error "Library not found.")

(toLibName file) libs

let sig1 = Map.findWithDefault (er gen_sig1) gen_sig1 sigs

let sig2 = Map.findWithDefault (er gen_sig2) gen_sig2 sigs

let sens = getSensFromDefs $ filter (\ d -> isLocalSym (getSym d) sig2)

$ getDefs sig2

return (sig1,sens)

where er n = error $ "Signature " ++ n ++ " not found."